A mill, concentrator, or smelter that purchases ore or partly processed
mineral for treatment in terms of an appropriate contract, priced on
tonnage, complexity of operation, permissible losses, and specification of
feed, product, and (perhaps) lost tailings. Pryor, 3
a. A smelter which buys ores or treats them for customers. Hess
b. A smelter which depends for its intake mostly on concentrate purchased
from independent mines and on scrap metal, rather than its own captive
mine sources. Wolff
a. An arrangement of holes used in underground mining and tunnel blasting
to provide a free face to which the remainder of the round can break.
Also, the opening created by the cut hole.
b. To intersect a vein or working.
c. To shear one side of an entry or crosscut by digging out the coal from
floor to roof with a pick. See also:undercut
d. Eng. In Somerset, a staple or drop pit.
e. Eng. The depth to which a drill hole is put in for blasting.
f. A term applied where the cutting machine has cut under the coal.
g. The drill-hole pattern for firing a round of shots in a tunnel or
sinking shaft, e.g., the burn cut. Nelson
h. A machine cut in a coal seam; e.g., floor cut. Nelson
i. See:stint; sump.
j. An excavation, generally applied to surface mining; to make an incision
in a block of coal; in underground mining, that part of the face of coal
that has been undercut. BCI
k. In mining, when used in conjunction with shaft and drift, a surface
opening in the ground intersecting a vein. Ricketts
l. Depth to which material is to be excavated (cut) to bring the surface
to a predetermined grade; the difference in elevation of a surface point
and a point on the proposed subgrade vertically below it.
Seelye, 2
m. To excavate coal.
n. To drive to or across a lode. Gordon
o. The groups of holes fired first in a round to provide additional free
faces for the succeeding shots. BS, 12
p. To lower an existing grade. Nichols, 1
A stoping method in which the ore is excavated by successive flat or
inclined slices, working upward from the level, as in shrinkage stoping.
However, after each slice is blasted down, all broken ore is removed, and
the stope is filled with waste up to within a few feet of the back before
the next slice is taken out, just enough room being left between the top
of the waste pile and the back of the stope to provide working space. The
term cut-and-fill stoping implies a definite and characteristic sequence
of operations: (1) breaking a slice of ore from the back; (2) removing the
broken ore; and (3) introducing filling. See also:underhand longwall
Scot. An incline on which cut chains are used.
a. The first hole or group of holes fired in a drift or tunnel face. Also
known as the cut portion of the blasting round. Lewis
b. In tunneling, easers so drilled and fired as to break out a leading
wedge-shaped hole and thus enable the later holes in the complete round of
shots to act more effectively. See also:trimmers; drill-hole pattern.
Pryor, 3
a. A variety of exinite. The micropetrologic constituent, or maceral, of
cuticular material. CF:sporinite
b. Maceral of the exinite group consisting of plant cuticle.
CF:resinite
This type of coal consists of more than 50% of cuticle, the fragments of
which occur embedded in gelito-collinite, fusinito-collinite, and
collinite of fusinitic nature. In addition to cuticle, spores, resin
bodies, and fragments of finely fusinized and gelified tissue are present.
Leaf parenchyme and stem tissue, bordered by cuticle, may also be seen.
Hand specimens of this type of coal are grayish-black, matt or semimatt,
finely striated, or sometimes even banded. The coal breaks angularly and
generally has high ash. Cutinite coal occurs as thin bands in seams of
different geological age, and its use is largely determined by the other
forms of coal with which it is associated. IHCP
a. In firing a round of shots, a misfire due to severance of fuse owing to
rock shear as adjacent charge explodes. Pryor, 3
b. A quarryer's term for the direction along which granite must be
channeled, because it will not split. Same as hardway.
c. CF:cutoff entry
d. The number of feet a bit may be used in a particular type of rock (as
specified by the drill foreman). Long
e. An impermeable wall, collar, or other structure placed beneath the base
or within the abutments of a dam to prevent or reduce losses by seepage
along a construction interface or through porous or fractured strata. It
may be made of concrete, compacted clay, interlocking sheet piling, or
grout injected along a line of holes. AGI
f. A boundary, oriented normal to bedding planes, that marks the areal
limit of a specific stratigraphic unit where the unit is not defined by
erosion, pinchout, faulting, or other obvious means. Cutoffs are
applicable to map, cross-sectional, and three-dimensional views, and are
in effect specialized facies boundaries. AGI
g. Minimum percentage of mineral or metal in an ore that can be mined
profitably. Long
h. A device for cutting off; as a mechanism for shutting off the admission
of a working fluid (as steam) to an engine cylinder. Webster 3rd
i. The point in the stroke of the piston of a steam engine at which the
entrance of live steam is stopped by the closure of the inlet valve.
Long
An entry driven to intersect another and furnish a more convenient outlet
for the coal. CF:cutoff
The lowest grade of mineralized material that qualifies as ore in a given
deposit; rock of the lowest assay included in an ore estimate.
Missed hole resulting from the failure of a blasting cap to detonate owing
to the breaking of a fuse or conductor or to some other similar cause.
Fraenkel
A shot in a delay round in which the charge has been wholly or partially
exposed to the atmosphere by reason of the detonation of an earlier shot
in the round. BS, 12
a. Opening made in a mine working in which a drill or other equipment may
be placed so as not to interfere with other mining operations.
Long
b. The act or process of removing diamonds from a used or dull bit by
dissolving the crown metal by corrosive action of an acid or electrolytic
dissolution. Also, the diamonds recovered or salvaged by such means.
Long
c. A mass of shale, siltstone, or sandstone filling an erosional channel
cut into a coal seam. CF:low; roll; washout. Syn:horseback; want.
AGI
The value of a property (e.g., density or size) at which a separation into
two fractions is desired or achieved. BS, 5
a. A shot designed to bring down coal that has been sheared or opened on
one side. Fay
b. A shot that initially breaks ground to provide a free face for
subsequent shots. BS, 12
a. Originally, an artificially broken and shaped carbon; now generally, a
faceted diamond or other precious or semiprecious gemstone used as an
ornament. Syn:gem
b. Structural unit for limestone that consists of blocks that are cut to
specified dimensions and surface tooled. AIME, 1
Diamond material suitable for cutting into gems. Chandler
a. A joint in a rock that is parallel to the dip of the strata.
CTD
b. A crack in a crystal that destroys or lessens its value as a lapidary's
stone.
c. On a hydraulic dredge, a set of revolving blades at the end of the
suction line.
d. Closed or inconspicuous seams along which rock may separate or break
easily.
e. Any coal-cutting or rock-cutting machine; or the person operating it.
f. A solution crevice in limestone underlying Tennessee residual phosphate
deposits. AGI
g. See:underreamer lug
That part of a chain mining machine that supports the cutting chain and
extends under the coal; the bar provides the track for the cutting chain.
Fay; BCI
The endless chain carrying picks that travels around the jib of a chain
coal cutter at a speed varying from 320 to 650 ft/min (97.6 to 198.2
m/min). See also:coal-cutter pick